Short-circuiting device for alternating-current motors



Oct. 21 1924.

J. L. HADLEY ET AL SHORT CIRCUITING DEVICE FOR ALTERNATING CURRENT MOTORS Filed March 28 1921 3 Sheets-Sheet l Oct. 21 1924. 1,5 ,534

J. L. HADLEY ET AL SHORT GIRCUITING DEVICE FOR ALTERNATIN CURRENT MOTORS Filed March 28, 1921 :s Sheets-Sheet 2 Ki [2 311mm;

5 2 @511 w M f g Oct. '21 I924.

.LL. HADLEY ET AL SHORT CIRCUITI'NG DEVICE FOR ALTERNATING CURRENT MOTORS 3 Shets-Shee t 5 Filed March 28.

Patented Oct. 21, 1924.

f UNITED STATES 1,512,534 PATENT OFFICE.

T. LEE HADLEY AND HERMAN G. REIIBEL, OF WARREN, OHIO, ASSIGNORS TO THE PEER- LESS ELECTRIC COMPANY, OF WARREN, OHIO, A CORPORATION OF OHIO.

- SHORT-CIRCUITING DEVICE FOR ALTERNATING-CUREENT MOTORS.

Application filed March 28, 1921. Serial No. 456,412.

To all whom it may concern: I

Be it known that we, J. .Lan HADLEY and HERMAN G. REIBEL, of Warren, in the.

exact description o the invention, such as will enable others skilledin the art to which i it appertains to make and use the same.

ure 1, with end plate removed to clearly show the short circuiting means.

Figure 3 shows the governor weights in short circuiting position. Figure 4 shows a commutator in vertical sectional view of a modified form with governor weights. Figure 5 is a detail of one of the weights.

We have shown the motor casing at 1, with bearings 2, 3, for the shaft 4 of the armature 5, and the commutator is indicated at 6.

Our improved short circuiting device is fitted on the shaft 4 and includes a cage-like member having a hub 10 through which the shaft extends and on whichshaft it is re movabl secured, and plates 12 and 13 which are held in spaced relation to each other by pins 14. Fitted for radial sliding movement between the plates 12 and 13 are weights 15, each of which is of segmental form and has a tongue 16 which lies between pairs of the pins 14 which thus form a guideway for the weights. Each of these segmental weights has a longitudinal groove 17 in its periphery into which an endless coiled spring 18 encircling the series of weights is designed to fit. The tension of the spring is such as to normall retain the segments in a position where t e ends of the tongue 16 will be in engagement with the shaft 4, but this tension is not great enough to retain the wei hts in this position under centrifugal in uence. The weights with the encircling spring have an inside position relative to the commutator bars and under centrifugal action the weights are effective to cause the spring to engage these bars, thus short circuiting the commutator. In Figures 4 and 5 we have shown a modified form, the weights therein illustrated being of sli htly' greater width than those previously referred to, and groove 27 extending the length of the periphery to one side of the longitudinal center line, this groove being adapted to receive spring 28 which encircles the series of segments. A second groove 29 extending in parallelism with the groove 27 receives small plates 30 transversely fitted in the groove, the plates being compactly arranged, and forming short circuiting bars which under the force of centrifugal action overcoming the counteraction of -t e spring 28 will contact with the commutator bars for short circuiting the commutator and transforming the motor from one operating on the repulsion principle to a motor of the induction type.

We claim as our invention:

1. In a motor, the combination with the commutator, and a rotatable shaft, of a cage secured to said shaft and including a pair of spaced apart plates, radially movable segmental weights fitting between said plates, a short circuiting means supported by said weights and adapted to engage said commu tator under the centrifugal influence of said weights, and a positive guiding means for each of said weights interposed between said p ates.

2. In a motor, the combination with the commutator, and a rota-table shaft, of a cage secured to said shaft and including a pair ofspaced apart plates, spacing pins between said plates, radially and independently movable weights fittingbetween said plates, each of said weights having a portion guided by pairs of said pins, and a short circuiting means supported by said weights and adapted to engage said commutator under the centrifugal influenceof said weights.

3. A short circuiting device for electric motors including, in combination with a commutator, radially movable segmental weights, each of said weights having its arcual periphery grooved, a tension member encircling said weights and fitting within said grooves, sue") member tending to restrain centrifugal movement of said weights, and adapted to mgage said commutator when said weights are moved under centrifugal influence.

4. A short circuiting device for electric motors includin in combination, with a commutator, ra iall movable segmental weights, each of said weights having its arcual periphery grooved, an endless coiled spring encircling said weights and fitting within said grooves, such coil spring tending to restrain centrifugal movement of said weights and adapted to engage said commutator when said weights are moved under centrifugal action.

5. In a motor, the combination with the commutator, and a rotatable shaft, of a cage secured to said shaft and including a pair of spaced apart plates, radially movable segmental weights fitting between said plates, each of said weights having its arcual periphery grooved, a tension member encircling said weights and fitting within said roove, said member tending to restrain centrlfugal movement of said weights and adapted to engage said commutator when said weights are moved under centrifugal action.

6. In a motor, the combination with the commutator, and a rotatable shaft, of a cage secured to said shaft and including a pair of spaced apart plates, spacing pins between said plates, radially movable segmental weights fitting between said plates, each of said plates havin a portion guided by pairs of said pins an its arcual periphery grooved, a tension member encircling said weights and fitting within said groove, such member tending to restrain centrifugal movement of said weights and adapted to engage said commutator when said weights are moved under centrifugal action 7. A short circuiting device for electric motors including, in combination with the commutator, radially movable segmental weights, a ci-rcumferentially arranged tension member in engagement with all of said segmental weights, such member tendin to restrain centrifugal movement of sai weights and adapted to engage said cominutator when said weights are moved. under centrifugal action, and an independent guiding means for each of said weights.

In testimony whereof we have signed this specification.

J. LEE HADLEY. HERMAN G. REIBEL. 

